\ compiler definitions 14sep97jaw
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\ \ Revisions-Log
\ put in seperate file 14sep97jaw
\ \ here allot , c, A, 17dec92py
[IFUNDEF] allot
[IFUNDEF] forthstart
: allot ( n -- ) \ core
dup unused u> -8 and throw
dp +! ;
[THEN]
[THEN]
\ we default to this version if we have nothing else 05May99jaw
[IFUNDEF] allot
: allot ( n -- ) \ core
\G Reserve @i{n} address units of data space without
\G initialization. @i{n} is a signed number, passing a negative
\G @i{n} releases memory. In ANS Forth you can only deallocate
\G memory from the current contiguous region in this way. In
\G Gforth you can deallocate anything in this way but named words.
\G The system does not check this restriction.
here +
dup 1- usable-dictionary-end forthstart within -8 and throw
dp ! ;
[THEN]
: c, ( c -- ) \ core c-comma
\G Reserve data space for one char and store @i{c} in the space.
here 1 chars allot [ has? flash [IF] ] flashc! [ [ELSE] ] c! [ [THEN] ] ;
: , ( w -- ) \ core comma
\G Reserve data space for one cell and store @i{w} in the space.
here cell allot [ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] ;
: 2, ( w1 w2 -- ) \ gforth
\G Reserve data space for two cells and store the double @i{w1
\G w2} there, @i{w2} first (lower address).
here 2 cells allot [ has? flash [IF] ] tuck flash! cell+ flash!
[ [ELSE] ] 2! [ [THEN] ] ;
\ : aligned ( addr -- addr' ) \ core
\ [ cell 1- ] Literal + [ -1 cells ] Literal and ;
: align ( -- ) \ core
\G If the data-space pointer is not aligned, reserve enough space to align it.
here dup aligned swap ?DO bl c, LOOP ;
: maxalign ( -- ) \ gforth
\G Align data-space pointer for all alignment requirements.
here dup maxaligned swap
?DO
bl c,
LOOP ;
\ the code field is aligned if its body is maxaligned
' maxalign Alias cfalign ( -- ) \ gforth
\G Align data-space pointer for code field requirements (i.e., such
\G that the corresponding body is maxaligned).
' , alias A, ( addr -- ) \ gforth
' NOOP ALIAS const
\ \ Header 23feb93py
\ input-stream, nextname and noname are quite ugly (passing
\ information through global variables), but they are useful for dealing
\ with existing/independent defining words
: string, ( c-addr u -- ) \ gforth
\G puts down string as cstring
dup [ has? rom [IF] ] $E0 [ [ELSE] ] alias-mask [ [THEN] ] or c,
[ has? flash [IF] ]
bounds ?DO I c@ c, LOOP
[ [ELSE] ]
here swap chars dup allot move
[ [THEN] ] ;
: longstring, ( c-addr u -- ) \ gforth
\G puts down string as longcstring
dup , here swap chars dup allot move ;
[IFDEF] prelude-mask
variable next-prelude
: prelude, ( -- )
next-prelude @ if
align next-prelude @ ,
then ;
[THEN]
: header, ( c-addr u -- ) \ gforth
name-too-long?
dup max-name-length @ max max-name-length !
[ [IFDEF] prelude-mask ] prelude, [ [THEN] ]
align here last !
-1 A,
string,
cfalign ;
: header ( "name" -- )
parse-name name-too-short? header, ;
: latestxt ( -- xt ) \ gforth
\G @i{xt} is the execution token of the last word defined.
\ The main purpose of this word is to get the xt of words defined using noname
lastcfa @ ;
: latest ( -- nt ) \ gforth
\G @var{nt} is the name token of the last word defined; it is 0 if the
\G last word has no name.
last @ ;
\ \ literals 17dec92py
: Literal ( compilation n -- ; run-time -- n ) \ core
\G Compilation semantics: compile the run-time semantics.@*
\G Run-time Semantics: push @i{n}.@*
\G Interpretation semantics: undefined.
[ [IFDEF] lit, ]
lit,
[ [ELSE] ]
postpone lit ,
[ [THEN] ] ; immediate restrict
: 2Literal ( compilation w1 w2 -- ; run-time -- w1 w2 ) \ double two-literal
\G Compile appropriate code such that, at run-time, @i{w1 w2} are
\G placed on the stack. Interpretation semantics are undefined.
swap postpone Literal postpone Literal ; immediate restrict
: ALiteral ( compilation addr -- ; run-time -- addr ) \ gforth
[ [IFDEF] alit, ]
alit,
[ [ELSE] ]
postpone lit A,
[ [THEN] ] ; immediate restrict
Defer char@ ( addr u -- char addr' u' )
:noname over c@ -rot 1 /string ; IS char@
: char ( '<spaces>ccc' -- c ) \ core
\G Skip leading spaces. Parse the string @i{ccc} and return @i{c}, the
\G display code representing the first character of @i{ccc}.
parse-name char@ 2drop ;
: [char] ( compilation '<spaces>ccc' -- ; run-time -- c ) \ core bracket-char
\G Compilation: skip leading spaces. Parse the string
\G @i{ccc}. Run-time: return @i{c}, the display code
\G representing the first character of @i{ccc}. Interpretation
\G semantics for this word are undefined.
char postpone Literal ; immediate restrict
\ \ threading 17mar93py
: cfa, ( code-address -- ) \ gforth cfa-comma
here
dup lastcfa !
[ has? rom [IF] ] 2 cells allot [ [ELSE] ] 0 A, 0 , [ [THEN] ]
code-address! ;
[IFUNDEF] compile,
defer compile, ( xt -- ) \ core-ext compile-comma
\G Compile the word represented by the execution token @i{xt}
\G into the current definition.
' , is compile,
[THEN]
' , is compile,
: !does ( addr -- ) \ gforth store-does
latestxt does-code! ;
: (compile) ( -- ) \ gforth-obsolete: dummy
true abort" (compile) doesn't work, use POSTPONE instead" ;
\ \ ticks
: name>comp ( nt -- w xt ) \ gforth name-to-comp
\G @i{w xt} is the compilation token for the word @i{nt}.
(name>comp)
1 = if
['] execute
else
['] compile,
then ;
: [(')] ( compilation "name" -- ; run-time -- nt ) \ gforth bracket-paren-tick
(') postpone ALiteral ; immediate restrict
: ['] ( compilation. "name" -- ; run-time. -- xt ) \ core bracket-tick
\g @i{xt} represents @i{name}'s interpretation
\g semantics. Perform @code{-14 throw} if the word has no
\g interpretation semantics.
' postpone ALiteral ; immediate restrict
: COMP' ( "name" -- w xt ) \ gforth comp-tick
\g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
(') name>comp ;
: [COMP'] ( compilation "name" -- ; run-time -- w xt ) \ gforth bracket-comp-tick
\g Compilation token @i{w xt} represents @i{name}'s compilation semantics.
COMP' swap POSTPONE Aliteral POSTPONE ALiteral ; immediate restrict
: postpone, ( w xt -- ) \ gforth postpone-comma
\g Compile the compilation semantics represented by the
\g compilation token @i{w xt}.
dup ['] execute =
if
drop compile,
else
swap POSTPONE aliteral compile,
then ;
: POSTPONE ( "name" -- ) \ core
\g Compiles the compilation semantics of @i{name}.
COMP' postpone, ; immediate
\ \ recurse 17may93jaw
: recurse ( compilation -- ; run-time ?? -- ?? ) \ core
\g Call the current definition.
latestxt compile, ; immediate restrict
\ \ compiler loop
: compiler1 ( c-addr u -- ... xt )
2dup find-name [ [IFDEF] prelude-mask ] run-prelude [ [THEN] ] dup
if ( c-addr u nt )
nip nip name>comp
else
drop
2dup 2>r snumber? dup
IF
0>
IF
['] 2literal
ELSE
['] literal
THEN
2rdrop
ELSE
drop 2r> compiler-notfound1
THEN
then ;
: [ ( -- ) \ core left-bracket
\G Enter interpretation state. Immediate word.
['] interpreter1 IS parser1 state off ; immediate
: ] ( -- ) \ core right-bracket
\G Enter compilation state.
['] compiler1 IS parser1 state on ;
\ \ Strings 22feb93py
: S, ( addr u -- )
\ allot string as counted string
[ has? flash [IF] ]
dup c, bounds ?DO I c@ c, LOOP
[ [ELSE] ]
here over char+ allot place align
[ [THEN] ] ;
: mem, ( addr u -- )
\ allot the memory block HERE (do alignment yourself)
[ has? flash [IF] ]
bounds ?DO I c@ c, LOOP
[ [ELSE] ]
here over allot swap move
[ [THEN] ] ;
: ," ( "string"<"> -- )
[char] " parse s, ;
\ \ Header states 23feb93py
\ problematic only for big endian machines
: cset ( bmask c-addr -- )
tuck c@ or swap c! ;
: creset ( bmask c-addr -- )
tuck c@ swap invert and swap c! ;
: ctoggle ( bmask c-addr -- )
tuck c@ xor swap c! ;
: lastflags ( -- c-addr )
\ the address of the flags byte in the last header
\ aborts if the last defined word was headerless
latest dup 0= abort" last word was headerless" cell+ ;
: immediate ( -- ) \ core
\G Make the compilation semantics of a word be to @code{execute}
\G the execution semantics.
immediate-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
: restrict ( -- ) \ gforth
\G A synonym for @code{compile-only}
restrict-mask lastflags [ has? rom [IF] ] creset [ [ELSE] ] cset [ [THEN] ] ;
' restrict alias compile-only ( -- ) \ gforth
\G Remove the interpretation semantics of a word.
\ \ Create Variable User Constant 17mar93py
: Alias ( xt "name" -- ) \ gforth
Header reveal
alias-mask lastflags creset
dup A, lastcfa ! ;
doer? :dovar [IF]
: Create ( "name" -- ) \ core
Header reveal dovar: cfa, ;
[ELSE]
: Create ( "name" -- ) \ core
Header reveal here lastcfa ! 0 A, 0 , DOES> ;
[THEN]
: buffer: ( u "name" -- ) \ core ext
Create allot ;
has? flash [IF]
: (variable) dpp @ normal-dp = IF Create dpp @
ELSE normal-dp @ Constant dpp @ ram THEN ;
: Variable ( "name" -- ) \ core
(Variable) 0 , dpp ! ;
: 2Variable ( "name" -- ) \ double two-variable
(Variable) 0 , 0 , dpp ! ;
[ELSE]
: Variable ( "name" -- ) \ core
Create 0 , ;
: 2Variable ( "name" -- ) \ double two-variable
Create 0 , 0 , ;
[THEN]
has? no-userspace 0= [IF]
: uallot ( n -- ) \ gforth
udp @ swap udp +! ;
doer? :douser [IF]
: User ( "name" -- ) \ gforth
Header reveal douser: cfa, cell uallot , ;
[ELSE]
: User Create cell uallot , DOES> @ up @ + ;
[THEN]
[THEN]
doer? :docon [IF]
: (Constant) Header reveal docon: cfa, ;
[ELSE]
: (Constant) Create DOES> @ ;
[THEN]
doer? :dovalue [IF]
: (Value) Header reveal dovalue: cfa, ;
[ELSE]
has? rom [IF]
: (Value) Create DOES> @ @ ;
[ELSE]
: (Value) Create DOES> @ ;
[THEN]
[THEN]
: Constant ( w "name" -- ) \ core
\G Define a constant @i{name} with value @i{w}.
\G
\G @i{name} execution: @i{-- w}
(Constant) , ;
: AConstant ( addr "name" -- ) \ gforth
(Constant) A, ;
has? flash [IF]
: Value ( w "name" -- ) \ core-ext
(Value) dpp @ >r here cell allot >r
ram here >r , r> r> flash! r> dpp ! ;
' Value alias AValue
[ELSE]
: Value ( w "name" -- ) \ core-ext
(Value) , ;
[THEN]
: 2Constant ( w1 w2 "name" -- ) \ double two-constant
Create ( w1 w2 "name" -- )
2,
DOES> ( -- w1 w2 )
2@ ;
doer? :dofield [IF]
: (Field) Header reveal dofield: cfa, ;
[ELSE]
: (Field) Create DOES> @ + ;
[THEN]
\ \ interpret/compile:
struct
>body
cell% field interpret/compile-int
cell% field interpret/compile-comp
end-struct interpret/compile-struct
: interpret/compile: ( interp-xt comp-xt "name" -- ) \ gforth
Create immediate swap A, A,
DOES>
abort" executed primary cfa of an interpret/compile: word" ;
\ state @ IF cell+ THEN perform ;
\ IS Defer What's Defers TO 24feb93py
defer defer-default ( -- )
' abort is defer-default
\ default action for deferred words (overridden by a warning later)
doer? :dodefer [IF]
: Defer ( "name" -- ) \ gforth
\G Define a deferred word @i{name}; its execution semantics can be
\G set with @code{defer!} or @code{is} (and they have to, before first
\G executing @i{name}.
Header Reveal dodefer: cfa,
[ has? rom [IF] ] here >r cell allot
dpp @ ram here r> flash! ['] defer-default A, dpp !
[ [ELSE] ] ['] defer-default A, [ [THEN] ] ;
[ELSE]
has? rom [IF]
: Defer ( "name" -- ) \ gforth
Create here >r cell allot
dpp @ ram here r> flash! ['] defer-default A, dpp !
DOES> @ @ execute ;
[ELSE]
: Defer ( "name" -- ) \ gforth
Create ['] defer-default A,
DOES> @ execute ;
[THEN]
[THEN]
: defer@ ( xt-deferred -- xt ) \ gforth defer-fetch
\G @i{xt} represents the word currently associated with the deferred
\G word @i{xt-deferred}.
>body @ [ has? rom [IF] ] @ [ [THEN] ] ;
: Defers ( compilation "name" -- ; run-time ... -- ... ) \ gforth
\G Compiles the present contents of the deferred word @i{name}
\G into the current definition. I.e., this produces static
\G binding as if @i{name} was not deferred.
' defer@ compile, ; immediate
: does>-like ( xt -- )
\ xt ( addr -- ) is !does or !;abi-code etc, addr is the address
\ that should be stored right after the code address.
>r ;-hook ?struc
[ has? xconds [IF] ] exit-like [ [THEN] ]
here [ has? peephole [IF] ] 5 [ [ELSE] ] 4 [ [THEN] ] cells +
postpone aliteral r> compile, [compile] exit
[ has? peephole [IF] ] finish-code [ [THEN] ]
defstart ;
:noname
here !does ]
defstart :-hook ;
:noname
['] !does does>-like :-hook ;
interpret/compile: DOES> ( compilation colon-sys1 -- colon-sys2 ; run-time nest-sys -- ) \ core does
: defer! ( xt xt-deferred -- ) \ gforth defer-store
\G Changes the @code{defer}red word @var{xt-deferred} to execute @var{xt}.
>body [ has? rom [IF] ] @ [ [THEN] ] ! ;
: <IS> ( "name" xt -- ) \ gforth
\g Changes the @code{defer}red word @var{name} to execute @var{xt}.
' defer! ;
: [IS] ( compilation "name" -- ; run-time xt -- ) \ gforth bracket-is
\g At run-time, changes the @code{defer}red word @var{name} to
\g execute @var{xt}.
' postpone ALiteral postpone defer! ; immediate restrict
' <IS>
' [IS]
interpret/compile: IS ( compilation/interpretation "name-deferred" -- ; run-time xt -- ) \ gforth
\G Changes the @code{defer}red word @var{name} to execute @var{xt}.
\G Its compilation semantics parses at compile time.
' <IS>
' [IS]
interpret/compile: TO ( w "name" -- ) \ core-ext
: interpret/compile? ( xt -- flag )
>does-code ['] DOES> >does-code = ;
\ \ : ; 24feb93py
defer :-hook ( sys1 -- sys2 )
defer ;-hook ( sys2 -- sys1 )
0 Constant defstart
[IFDEF] docol,
: (:noname) ( -- colon-sys )
\ common factor of : and :noname
docol, ]comp
[ELSE]
: (:noname) ( -- colon-sys )
\ common factor of : and :noname
docol: cfa,
[THEN]
defstart ] :-hook ;
: : ( "name" -- colon-sys ) \ core colon
Header (:noname) ;
: :noname ( -- xt colon-sys ) \ core-ext colon-no-name
0 last !
cfalign here (:noname) ;
[IFDEF] fini,
: ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
;-hook ?struc fini, comp[ reveal postpone [ ; immediate restrict
[ELSE]
: ; ( compilation colon-sys -- ; run-time nest-sys ) \ core semicolon
;-hook ?struc [compile] exit
[ has? peephole [IF] ] finish-code [ [THEN] ]
reveal postpone [ ; immediate restrict
[THEN]
\ \ Search list handling: reveal words, recursive 23feb93py
: last? ( -- false / nfa nfa )
latest ?dup ;
Variable warnings ( -- addr ) \ gforth
G -1 warnings T !
: reveal ( -- ) \ gforth
last?
if \ the last word has a header
dup ( name>link ) @ -1 =
if \ it is still hidden
forth-wordlist dup >r @ over
[ has? flash [IF] ] flash! [ [ELSE] ] ! [ [THEN] ] r> !
else
drop
then
then ;
' reveal alias recursive ( compilation -- ; run-time -- ) \ gforth
\g Make the current definition visible, enabling it to call itself
\g recursively.
immediate restrict
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